Rock drill



J. c. CURTIS El AL ROCK DRILL May 11, 1943.

Filed June 25, 1940 s Sheets-Sheet 1' m wmm M WWW 2r 6 a J m 5 @w mm \N mm Mm 11, 1943'. J. c. cum-1s ETAL ROCK DRILL Filed June 25, 1940 3 Sheets-Sheet 2 .6212 22'5. 6722262 6? 5622 2272. I 192...; ,4- wm- 1022226 lawzziww IIIIIIIIIIIII 11, 19 43. J. c. CURTIS EQIAL ROCK DRILL Filed June 25, 1940 3 Sheets-Sheet 3 lzzvezzioza' @1022 66912 225.

Wm m y Patented May 11, 1943 STATES PATENT s race ROCK DRILL John C. Curtis and Elmer G. Gartin, Claremont,

N. H., assignors'to Sullivan Machinery Company, a corporation of Massachusetts Application June 25, 1940, Serial No. 342,327

17 Claims.

supporting, guiding and feeding means for arock drill hammer motor of the mounted type. It is still another object of this invention-to provide an improved feed screw and nut arrangement supported for operative engagement with a drill hammer motor in an improved manner. Still another object of this invention is to provide an improved structure for supporting and guiding .a drill hammer motor relative to the work and having associated therewith motor feeding means supported and shielded by said structure from damaging biows. Yet a further object of the invention is to provide an improved drifter-type drilling apparatus having improved operative connection between the hammer motor and the feeding means therefor. These and other objects and advantages of the invention will hereinafter more fully appear.

In the accompanying drawings, in which for purposes of illustration one form and a modification of the invention have been shown Fig. 1 is a side eievational viewof a rock drilling apparatus having embodied therein one form: of the invention.

Fig. 2 is a pian view of the rock drilling apparatus shown in Fig. 1.

Fig. 3 is a rear end elevational view of the rock drilling apparatus shown in Fig. 1.

Fig. 4 is a front end elevational view of the rock drilling apparatus shown in Fig. 1.

Fig. 5 is a fragmentary vertical sectional view taken on the plane of the line 55 of Figs. ,1 and 7.

Fig. 6 is a longitudinal vertical sectionalview taken on the plane of the line 6-6 of Fig. 5 and showing the feed nut and a portion of the feed V screw.

Fig. 7 is a horizontal sectional view taken on the plane of the line 1-1 of Fig. 5 and showing the rear portion of the improved guiding and feeding means for the drill hammer motor.

Fig. 8 is a plan view with parts broken away,

of the forward portion of the improved guiding and feeding means.

Fig. 9 is a vertical sectional view taken on the plane of the line 99 of Fig. 8.

Fig. 10 is a vertical transverse sectional view taken on the line Ill-Ill of Fig; '7.

Fig. 11 is a vertical sectional view' like that of Fig. 6 but showing a modified form of connection between the feed nut and the drill motor.

Fig. 12 is a vertical sectional viewtaken on line l2'-l2 of.Fi ..11.

In the illustrative form. of the invention shown in Figs. 1 to 10 inclusive, a hammer moton generally designated I, is mounted upon an improved supporting and guiding means 2 ,and' is operatively,c0nnected in an improved manner to feeding means 3, as shown in. Fig. 6.

The hammer motor is ,shown as of the usual reciprocating hammer piston type andin'cludes a cylinderfi having a front chuck housing 6 containinga chuck (not shown) for receiving the shank of a drill steel 1. At the rear end of the cylinder is a head block 8 having connected thereto a supplyline .53 for supplying pressure fluid to the motor cylinder. The chuck housing 6 and the rear head =lolockjii may be secured to th motor cylinder in any suitable manner and are shown here as being held in assembledrelation by side rods ll. Atthe sides of the motor cylinder are boss-like projections 12 having alined openings for receiving sleeve members M in positions. extending parallel tothelongit'udinal Guiderods It, later referred to in more detail, have asliding fit withinthe sleeve shaped members 14 and form part of thesupporting andguiding ,rneans 2, for the hammer. motor.

Referring to the improved supporting a d guiding means 2, it will be noted that there is provided, a swivel plate lj8 ,adapted for mounting ,in the clamp of a conventional saddle", mounting,

and formed integral with ,theswivel plate is an elongated body portion l9 providing an .arcuate shaped trough 20 within whichagenerally tubular-shaped member 2| is fixed in any suitable manner,,as, for example, by welding, by clamping, by screws, .etc. At theforwardend'of the tubular shaped member is ,a transversely extending support member 23 having midway ,betweenits sides asleeveportion. 2d fittingwi'thin the. end of the bore inthemember 2l,,as shown in,Fig.,9. Formed herein. in oppositely extendingarm portions of thesuppor't member are openings 25 for receiving the forward reduced ends. of the guide rods IB'. NutsZB threaded uponthe ends Offlthe guide rods hold the support member and thejguide rods firmly together. At the rearwa d end of the tubular shaped member 21 is. atransverselypextending support member 28 having a bore 29 midway between its sides for receiving the rearward end ofthetubular member, and the support member 28 is split at the lower side of the opening 29 and provided with projecting portion 36 carrying a clamping bolt 3| for clamping the support member onto the tubular shaped member 2|. At the outermost portions of the support member 28 are openings for receiving the reduced, threaded rear ends of the guide rods "5. Nuts 32 screwed on the threaded rear ends of the guide rods H at opposite sides of the support member 28 are provided for adjustably clamping the support member and the guide rods rigidly together. A feed screw 33 extends axially through the tubular member 2| and is rotatably supported at its forward end within a spool shaped member 35 fitting within the bore of the tubular member as shown in Fig. 9. A bolt 36 threaded in an opening 37 through the tubular member 2| projects into a groove 38 in the outer surface of the spool shaped member and holds it against movement longitudinally of the tube. The rearward end of the feed screw is rotatably supported by a projectin portion 40 formed integrally with and extending rearwardly from the support member 28. Attached to the rearward end of the feed screw is a handle 4| providing for manual rotation of the feed screw. Formed in the upper side of the tubular member 2| is an opening 42 extending from the rearward end of the tube to a point spaced a short distance from its forward end. Projecting from the lower sides of the head block 8 and the cylinder 5 are portions 44 and 45 respectively and both of these portions project into the opening 42. The portion 44 includes an annular portion 46 projecting into and herein shown as slidingly fitting the bore of the tubular member, and mounted within the annular portion 46 is a feed nut 41 which is in threaded engagement with the feed screw. The rearward end of the feed nut is provided with an enlarged portion 49 for abutting the annular portion 46, and the upper side of the enlarged portion is provided with a fiat surface 50 for engaging a fiat surface 5| on the portion 44 and holding the feed nut against rotation relative to the hammer motor. The forward end of the feed nut extends beyond the annular portion 46 and has threaded thereon a nut 53 for clamping the feed I nut firmly within the annular portion. A fiat 'with an opening 51 within which a cylindrical portion of a key 59 is fixed in any suitable manner, and a portion 6|] on the key projects into the bore 29 and fits the elongated opening 42 for looking the tubular member 2| against rotation relative to the hammer motor and precluding distortion thereof by the clamp mechanism 30, 3

In the modification shown in Figs; 11 and 12, the structure is the same as that described above except that a feed nut 62 fits within the bore of the tubular member 2| and is provided with portions 63 projecting through the opening 42 in the tubular member and fitting within recesses 65 in the lower surface of the motor cylinder for looking the hammer motor and feed nut against rectilinear movement relative to each other. Between the portions 63 on the feed nut are projecting portions 66 on the motor cylinder fitting within the opening 42 in the tubular member and interlocking with the projections 63. In this form of the invention it will be understood that the hammer motor can be disconnected from the feed screw without having to effect withdrawal of the feed screw from within 21. depending annular portion such as the portion 46 of the species of Figs. 1 to 10 inclusive; and no partial disassembly of the hammer motor is necessary to accomplish disassembly of the hammer motor from its guiding and supporting structure.

Assembling of the structure of Figs. 1 to 10 inclusive may easily be accomplished with the handle 4| and the member 28 removed. The nut 53 and washer 56 may be slid onto the feed screw; the separated rear head 8 of the motor can be put on over the feed screw, the feed nut threaded on the screw and gotten into the bore in the annular depending portion 46; the washer 56 and nut 53 may then be brought into the position of Fig. 6; the main portion of the hammer motoryon the guides l6, may be secured to the rear head 8; the parts may all be thrust forward as may be necessary; and the member 28 and the handle 4| be put and secured in their places. The mode of assembly of the modification of the invention will be clear from what has been said about th first species.

structure with the parts of the feeding means which might be most readily injured shielded against possible damaging blows. It will further be noted that the parts may be easily assembled and provide an effective arrangement that is strong and durable. Rod type guides are provided in a rigid but simple construction and in the modification of the invention, particularly, disassembly is relatively simplified. Moreover, no danger of loosening of the connection of the feed nut to the hammer motor is possible with the constructions disclosed.

While there are in this application specifically described one form and a modification which the invention may assume in practice, it will be understood that these are shown for purposes of illustration and that the invention may be further modified and embodied in various other forms without departing from the spirit or the scope of the appended claims.

What we claim as new and desire to secure by Letters Patent is:

1. In a rock drilling mechanism, in combination, a rock drill, and feeding and supporting means for said drill comprising a central trunnion support, a tubular shaped member secured to said trunnion support and extending longitudinally of said drill, a feed screw arranged within and supported axially of said tubular shaped member, guiding and supporting means for said drill, and means for operatively connecting said rock drill to said feed screw including an'annular shaped portion formed on said rock drill and fitting within said tubular shaped member, said annular portion slidably engaging the walls of said tubular member for guided movement longitudinally of the latter, a feed nut in operative engagement with said feed screw, and means for clamping said feed nut to said annular shaped portion.

2. In a rock drilling mechanism, in combination, a rock drill, a tubular shaped support member extending longitudinally of said drill, guide rods supported by said tubular shaped support member in positions parallel to the latter, guide portions formed onsaid rock drill and slidably engaging said guide rods forguiding said rock drill for movement longitudinally of said tubular support member, a feed screw arranged within said tubular shaped member and extending par,

-allel to a line parallel to the axis of the latter,

and means operatively connecting said rock drill to said-feed screw including a feed nut engaging said feed screw and held against movement relative to said rock drill.

3. In a rock drilling mechanism, in combination, a rock drill, a tubular shaped support'mem- 'ber extending longitudinally of said drill, guide rods supported by said tubular shaped support nut engaging said feed screw and held against movement relative to said rock drill, and means for rotating said feed screw to effect movement of said feed nut and rock drill therealong.

'4. In a rock drilling mechanism, in combination, a rock drill, a tubular shaped support member extending longitudinally of said drill, guide rods supported by said tubular shaped support member in positions parallel to the latter, guide portions formed on said rock drill and slidably engaging said guide rods for guiding said rock drill for movement longitudinally of said tubular support member, a feed screw arranged within said tubular shaped member and extending parallel to a line parallel to the axis of the latter,

an opening through said tubular shaped member and extending longitudinally thereof, and means for operatively connecting said rock drill to said feed screw including a portion formed on said rock drill and extending through said opening, a feed nut in engagement with said feed screw, and means for clamping said feed nut'to the portion extending through said opening.

5. In a rock drilling mechanism, in combination, a rock drill, a tubular shaped support member extending longitudinally of said drill, guide rods supported by said tubular shaped support member in positions parallel to the latter, guide portions formed on said rock drill and slidably engaging said guide rods for guiding said rock drill longitudinally with respect to said tubular support member, a feed screw arranged within said tubular shaped member and extending parallel to a line parallel to the axis of the latter, an opening through said tubular shaped member and extending longitudinally thereof, a feed nut in operative engagement with said feed screw, and means for holding said feed nut against movement relative to said rock drill and including portions formed on said feed nut extending through said opening into engagement with said rock drill.

6. In combination, means forming a pair of parallel guides, a feed screw, means for mounting said feed screw for rotation on an axis extending parallel to said guides, a feed nut threadedly engaged with said feed screw, guiding means stationary with respect to said guides extending longitudinally of said feed screw, said feed nut slidably guided by said guiding means, a drilling motor supported by said parallel guides for movement along the latter, and operative connections 75 between said motor and feed nut holding the latter against movement relative to said motor and movable, upon feeding of said drilling mo.- to'r, between said guiding means.

7. In combination, means forming a pair of parallel guides, 'a feed screw, means for mount ing said feed screw for rotation on an axisextending'parallel to said guides, a feednut threadedly engaged with said feed screw, guiding means stationary with respect to said guides extending longitudinally of said feed screw, said feed nut slidably guided by said guiding means, a drilling motor supported by said parallel guides for movement along'the latter, and operative connections between said motor and feed nut holding the latter-against movement relative'to said motor and movable, upon feeding of said drilling motor, between said guiding means and including interlocking connections carried in part by said motor and in part by said feed nutand disengageable -by relative movement between said motor and feed nut-in a direction transverse to the axisof said nut.

-8. In combination, a support, a slotted tubular member carried by said support, end members carried by the opposite ends of said slotted-tubular member, guide rods extending between said end members in parallelism with the axis of said slotted tubular member, a hammer motor supported on and guided by said guide rods, a feed screw extending longitudinally within said slotted tubular member, a iced nut on said I feed screw movable longitudinallywithin said slotted tubular member and slidably guided by the latter, and operative connections between. said nut andv mo.-

tor extending through the slot in said tubular member.

9. In combination, a support, a slotted tubular member carried by said support, end members carried by the opposite ends of said slotted-tubular member, guide rods extending between said end members in parallelism with the axis of said slotted tubular member, a hammerv motor sup ported on and guided by said guide rods, a feed screw extending longitudinally within saidslotted tubular member, a feed nut on said feed screw movable longitudinally within said slotted tubular member, and operative connections'between said nut and motorextending through the slot in said tubular member including portions on said nut projecting through said slot.

10. In combination, a support, a slotted tubular member carried by said support, end members carried by the opposite ends of said slotted tubular member, guide rods extending between said end members in parallelism with the axis of said slotted tubular member, a hammer motor supported on and guided by said guide rods, a feed screw extending longitudinally within said slotted tubular member, a feed nut on said feed screw movable longitudinally within said slotted tubular member, and operative connections between said nut and motor extending through the slot in said tubular member including a feed nut boss carried by said motor and guided within said tubular member.

11. In combination, a support, a slotted tubular member carried by said support, a drill motor guided for movement longitudinally of said tubular member, means for guiding said drill motor including guide members supported by said tubular member and extending parallel to the axis of the latter, a feed screw extending longitudinally within said tubular member, a feed nut on said feed screw movable longitudinally within said. tubular member, and operative connections between said, nut and motor including a portion .formed on said motor projecting within the slot of said tubular member and having grooves 'therein extending transversely of said slotand projecting portions on said nut fitting within said grooves.

12; In a rock drilling mechanism, in combination, a rock drill, supporting and guiding means therefor along which the rock drill is movable during feeding and upon which the rock drill is supported during drilling, a feed screw extending longitudinally of said guiding means, a feed nut supported by said guiding means for guided movement therealong, and detachable connections between said rock drill and said feed nut including at least one transverse projection on one of the same and a transverse opening in the other for receiving said projection.

13. In a rock drill, in combination, a drill steel actuator, and feeding and supporting means for said actuator including a tubular shaped member extending lengthwise of the drill, a feed screw arranged within and supported axially of said tubular shaped member, said supporting means providing a longitudinal guideway substantially coextensive with said member and along which said actuator is guided for movement, a feed nut threadedly engaging said feed screw, said feed nut fitting within and conforming in shape to and having sliding engagement with the inside walls of said tubular shaped member and supported by the latter independently of said actuator, and operative connections between said feed nut and said actuator.

14. In a rock drill, in combination, a drill steel actuator, supporting and guiding means: for said actuator including a cylindric hollow member and providing a guideway for said actuator extending substantially coextensively with said hollow member, said hollow member having a 'narrow opening extending longitudinally along one side thereof, feeding means for said actuator including a feed screw extending centrally within said hollow member and a feed nut threadedly;

engaging said screw and arranged within and slidingly engaging the inside walls of said hollow member substantially throughout the circumferential extent thereof, said feed nut being supported by said hollow member independently of said actuator, and operative connections between said feed nut and said actuator including a connecting portion extending through said narrow opening.

15. In a rock drill, in combination, a drill steel actuator, supporting and guiding means for said actuator along which the latter is guided during the drilling operation, feeding means for said actuator including a feed screw extending longitudinally of said supporting and guiding means and a feed nut threadedly engaging said screw and uided for movement along said guiding means with said actuator, said feed nut being supported by said guiding means independently of said actuator, and an operative detachable connection between said actuator and said feed nut, said connection connectin said actuator for guided movement with said feed nut and freely detachable from said nut in a direction at right angles to the path of movement of said feed nut.

16. In a rock drill, the combination comprising a guide, a drill steel actuator movable along said guide, and means for eifecting feed of said drill steel actuator along said guide comprising a feed screw extending longitudinally of and journaled on said guide, a feed nut threadedly engaging said feed screw and guided for move- .ment along said guide concurrently with said drill steel actuator, and a detachable interengaging connection between said actuator and said feed nut, said connection interengaging said feed nut and said actuator for connecting the same together for guided movement and freely releasable upon relative lateral movement between said actuator and said nut.

17. In a rock drill, the combination comprising a guide, a drill steel actuator movable along said guide, and feeding means for said actuator comprising a feed screw extending lengthwise of and journaled on said guide, a feed nut guided on said guide wholly without support by said actuator, and a laterally releasable, interengaging connection between said feed nut and said actuator whereby the latter may be released from said feed nut while said nut remains in guided relation with said guide.

JOHN C. CURTIS. ELMER G. GARTIN. 

